I have HMS and tend to have weeks when I'm really weak (hormonally related ligament softness)
I do have days when I'll make sure there's a clear channel across the floor and ignore it, so I have the energy for bigger tasks.
I tend to prioritise myself tasks for the day, anyhow. Certain things are unnegotiable, such as laundry, breakfast and lunch dishes and cooking dinner.
I keep on top of the bathroom and hard floors with antibac or cleaning wipes. I'll shove a floor wipe around with my foot if I feel that going down means I'll not be able to get up again, but there's a mess that can't be ignored.
Days when i do have a lot planned eg vacuuming right into the corners and under the table, dusting, sorting clothes to put away, I'll switch between different tasks so that I don't spend too long in one position and I can rest muscle groups that might get tired or sore.
Food wise, I use a mixture of convenience and fresh food. I'll build a couple of fork stabby days into the week for when I'm very tired or one of the kids is needing closer supervision than normal (both have ASD). I always serve extra veg or salad with it, though. Nights like tonight, I did pasta, I used a good quality jarred sauce, with sauted peppers and courgettes (easy chopping with both, with a sharp knife) and a tin of tuna. DS2 doesn't eat pasta, so I took a small pizza out of the freezer for him.